基于高频导纳原理的液位传感器

介绍一种新型液位传感器。分析传统电容液位传感器在实用中的局限性,提出一种防挂料原理,变传统的单纯测量探头电容变化为测量在液位变化下探头的复阻抗的变化,并利用同步整流技术,抵消导电介质挂料造成的虚假信号。设计上,通过合理选取有关参数,避免了信号变换器和探头分置时分布电容的影响,使传感器可以用在高温介质测量场合。

Research on Level Transducer Based on RF-Admittance Technology

A new type of level transducer based on radio frequency admittance technology is introduced.To eliminate the coat effect of electrically conductive adhesive medium,the transducer measures admittance rather than pure capacity as in traditional capacitive transducer.Using synchronous demodulating technique,true level signal is obtained.With rational choice of component value,the conditioning circuits can be separated from the probe,so the transducer can be used in high temprature tank level measurement.